The Things They Carried Chapter 5: Enemies Summary
What happened in the chapter? Footmen, Lee Strunk, and Dave Jensen got into a vicious fight over a missing jackknife. Dave had the advantage because he was bigger and stronger, so Dave beat Strunk so bad he had to be choppered to an infirmary. Afterward, Dave became high-strung fearing that Strunk will get revenge, and took unnecessary precautions to avoid any contact with Strunk. Jensen couldn't relax and eventually started to think everyone was out to get him.
In this chapter, the readers can easily see how the tension of war is starting to affect the footmen, mentally. They seem more anxious and aggravated and have little to no trust between the men on the team. A little fight between the two men is described as "fighting two wars" at the same time.